west-zephyr: import all Zephyr modules

In case of west-zephyr.yml there is a name-allowlist filter, while in case of west-ncs.yml there is no such filter. This makes filtering logic inconsistent across Zephyr vanilla vs NCS.

Limiting repositories has a major flaw when user wants to utilize a generic library such as picolibc, which is filtered out. In that case it is needed to add that repository to downstream manifest or temporarily modify west-zephyr.yml in order to test some non-standard configuration with SDK samples.

Let's be consistent about Zephyr modules filtering and always import all the modules in west-zephyr.yml, just like it happens with west-ncs.yml.

Since limiting west-zephyr.yml was mainly a clone time improvement, noticeable in CI, add .ci-west-zephyr.yml which will limit repositories just for being run in CI.

golioth / golioth-zephyr-sdk

west-zephyr: import all Zephyr modules #351